Quarrying and all other branches of surface mining rather than
diminishing in importance have become of more and more consequence
economically, industrially and particularly with the depletion of
high-grade deep-mined mineral reserves. Low-grade minerals require
low cost extraction and this in many cases necessitates very
expensive mechanized equipment with the cost of individual units
running into millions of pounds in the case of large scale
operations with high productivity. There has been, and there still
is, a tendency for the smaller single quarries to be amalgamated
into groups with large financial resources and therefore with the
ability to purchase these expensive machines so necessary to make
operations viable. This in turn requires wider administrative and
technical knowledge in executives of these groups and as these
often handle a wide range of products from widely differing systems
of working, this technical knowledge should embrace the
exploitation of many different types of deposits. There is, at
present, a great dearth throughout the world of such qualified
executives as is apparent from advertisements of vacancies in the
technical press. It would appear that these industries offer an
attractive career to the widely qualified and experienced
technologist in these fields. This book deals with methods of
working in the surface extractive indus tries, quarry management
and power supply-but does not deal with related ancillary processes
except where these affect quarrying operations.
General
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